1.1\2x^+2xy+2y^2.8a-4a^-43.1-m^-n^+2mn提示:2\1是二分之一的意思,^是平方的意思.
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1.1\2x^+2xy+2y^2.8a-4a^-43.1-m^-n^+2mn提示:2\1是二分之一的意思,^是平方的意思.1.1\2x^+2xy+2y^2.8a-4a^-43.1-m^-n^+2mn提
1.1\2x^+2xy+2y^2.8a-4a^-43.1-m^-n^+2mn提示:2\1是二分之一的意思,^是平方的意思.
1.1\2x^+2xy+2y^
2.8a-4a^-4
3.1-m^-n^+2mn
提示:2\1是二分之一的意思,^是平方的意思.
1.1\2x^+2xy+2y^2.8a-4a^-43.1-m^-n^+2mn提示:2\1是二分之一的意思,^是平方的意思.
1. 1/2x^2+2xy+2y^2 =2(1/4x^2+xy+y^2) =2(1/2x+y)^2 2. 8a-4a^2-4 =-(-8a+4a^2+4) =-4(-2a+a^2+1) =-4(a-1)^2 3. 1-m^2-n^2+2mn =1-(m^2+n^2-2mn) =1-(m-n)^2 =-[(m-n)^2-1] =-[(m-n)-1][(m-n)+1] =-(m-n-1)(m-n+1)
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